On the Distribution of Acetyl Content of Partially Alcoholized. Polyvinyl Acetate.

Matsumoto, Masakazu; Takayama, Gozo

doi:10.1295/koron1944.18.169

Cited by 8 publications

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“…We have, accordingly, investigated the complex formation and the properties of PVA with the Cu(I1) ion and the determination of complex stability in the system of PVA and bivalent ions by means of potentiometic titrations. age molecular weight according to the method given by Matsumoto,4 and then each PVA fraction was completely hydrolyzed by alkali in methanol, The concentration of PVA used in these experiments was 4 x low2 ground mole/l. in aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Complex formation between poly(vinyl alcohol) and metallic ions in aqueous solution

Hōjō

Shirai

Hayashi

1974

J. polym. sci., C Polym. symp.

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SYNOPSISAs the basic research for the study of complex reactions in polymers, the complex formation of poly(viny1 alcohol) (PVA) with copper and other metals was tried. Spectroscopy, pH titration, and elementary analysis were employed in the reaction of PVA and Cu(I1) ions in aqueous solution. The complexing protonation was found in the higher pH region (above 7.0), and the maximum absorptions at 640 and 260 nm were observed. These were proportional to the concentrations of Cu(I1) ions bound to the hydroxyl groups of PVA. Formation constants of the PVA-Cu(I1) complexes were measured by applying a modified Bjerrum's method. The effects of the ratio TcP2+/T~r,, the anions in copper salts, and the degree of polymerization on the formation constants were studied. Four hydroxyl groups combined with one Cu(I1) ion in the pH range above 7.0. The stability constants for the complexes of PVA with bivalent transition metallic ions were in agreement with the Irving-William's series. The changes in viscosity, solubility, tacticity, mechanochemical phenomenon, and the other properties based on the complex formation are discussed. EXPERIMENTALMaterials PVA(NM-11 P= 1 lOO), aproduct of Nippon Synthetic Chemical Industry Co., was used. The PVA was separated into several fractions of different aver-299

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Section: Introductionmentioning

confidence: 99%

Complex formation between poly(vinyl alcohol) and metallic ions in aqueous solution

Hōjō

Shirai

Hayashi

1974

J. polym. sci., C Polym. symp.

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Untersuchung von Copolymeren durch Fraktionierung

Fuchs

1966

Ber Bunsenges Phys Chem

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Bei Copolymeren muß man stets mit dem Vorliegen mehrerer Arten von Uneinheitlichkeiten, wie Molekulargewichtsverteilung, ungleiche chemische Zusammensetzung der Makromoleküle, Inhomogenität hinsichtlich spezieller Strukturen (z. B. von Verzweigungen oder der Monomerenverteilung längs der Hauptkette), rechnen. Da die Löslichkeit der Makromoleküle besonders von deren Molekulargewicht und deren chemischem Aufbau abhängt, findet bei der Fraktionierung solcher Copolymere zwangsweise eine Überlagerung beider Arten von Uneinheitlichkeit statt. Die dadurch bedingten Schwierigkeiten bei der Fraktionierung werden an Hand mehrerer Beispiele erläutert. Die Brauchbarkeit der verschiedenen Trennmethoden zur Charakterisierung von Copolymeren wird diskutiert. Für die Möglichkeit einer Fraktionierung auch nach speziellen Struktureigenschaften werden einige Beispiele angeführt.

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Vinyl polymerization by metal complexes, 12. Initiation by poly(vinyl alcohol)‐copper(II) chelates

1974

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Initiation by Poly(viny1 alcohol)-Copper(I1) Chelates KEIICHI KIMURA, YOSHIAKI INAKI, and KIICHI TAKEMOTO Dedicated to Professor Dr. ICHIRO SAKURADA on his 70th birthday (Date of receipt: June 26, 1973) S U M M A R Y :The polymerizations of acrylonitrile, methyl methacrylate and styrene initiated by copper(I1) chelates were studied in the presence of carbon tetrachloride. Polymeric and dimeric cornpounds of vinyl alcohol, that is poly(vinyi alcohol) and 1,3-propanediol were chosen as ligands. It was found that these systems could initiate the polymerization of methyl methacrylate and styrene effectively. The activity of the polymer chelate was estimated by varying the metal/ ligand mole ratio of the initiator system, the pH values and the polymerization temperature. From the results, the mechanism of the free-radical formation was discussed. Z U S A M M E N F A S S U N G :Die durch Kupfer(I1)-Chelate initiierten Polymerisationen von Acrylnitril, Methylmethacrylat sowie von Styrol wurden in Gegenwart von Tetrachlorkohlenstoff untersucht. Als Liganden wurden polymerer und dimerer Vinylalkohol, d. h. Polyvinylalkohol und 1,3-Propandiol, gewahlt. Es ergab sich, daR diese Initiatorsysteme die Polymerisation von Methylmethacrylat und Styrol wirkungsvoll auslosen konnten. Die Aktivitat des polymeren Chelats wurde in Abhangigkeit von verschiedenen Metall/Ligand-Molverhaltnissen des Initiatorsystems, den pH-Werten und der Temperatur untersucht. Auf Grund der Ergebnisse wurde der Mechanismus fur die Radikalerzeugung diskutiert. *) Part 11, CJ z).95

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On the Distribution of Acetyl Content of Partially Alcoholized. Polyvinyl Acetate.

Cited by 8 publications

References 0 publications

Complex formation between poly(vinyl alcohol) and metallic ions in aqueous solution

Complex formation between poly(vinyl alcohol) and metallic ions in aqueous solution

Untersuchung von Copolymeren durch Fraktionierung

Vinyl polymerization by metal complexes, 12. Initiation by poly(vinyl alcohol)‐copper(II) chelates

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